<!DOCTYPE HTML>
<body style="margin:0">
<div style="margin:100px; width:100px; height:100px; filter:opacity(1);">
  <div style="position:absolute; left:50px; top:50px; width:200px; height:200px; background:lime;"></div>
  <div style="position:fixed; left:80px; top:80px; width:200px; height:200px; background:yellow;"></div>
</div>
